Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff8a8e7a8b7c9a0…

MALICIOUS

PDF

76.0 KB Created: 2021-07-13 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5bb240e29be3be4129645f07d5b1bd6 SHA-1: f8f03519c131903723228f5c6f357acb3b06f41b SHA-256: fff8a8e7a8b7c9a02d8d75893eff42727ad47cfa621b1eba8367eb9e63dea8bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'infrive.ru', which is likely a malicious domain used for phishing or malware distribution. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/square?utm_term=iron+sulfate+hydrate
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c6b661d88c0ca39fb7d3/1625867958872/glycemic_index_brown_rice.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ec8ce6a58043b68f0258/1625877644214/52150832453.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8203c1873c46ac93c5a94/1625825340904/21368465685.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecc3a5edb2c669a479a8aa/1626129317423/two_queens_in_chess.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecc5bb67465052541cd5cd/1626129851279/2345594272.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
font_01_sfnt_off0000e20c.bin
b5cea46477e4760f97818d5d24dbed7618e7eedab15db308d6f0cf88ff17d64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10524 bytes
font_02_sfnt_off0000f9fc.bin
b29ae126c4467b03391956246778535bc8756037e667aa108516d71c3e20d3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16428 bytes

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